Abstract: An iron-cobalt alloy containing in weight percentages: 10 to 22% of Co; traces to 2.5% of Si; traces to 2% of Al; 0.1 to 1% of Mn; traces to 0.0100% of C, a total of O, N and S content ranging between traces of 0.0070%; a total of Si, Al, Cr, Mo, V, Mn content ranging between 1.1 and 3.5%; a total of Cr, Mo and V content ranging between traces of 3%; a total of Ta and Nb content ranging between traces and 1%; and the rest being iron and impurities resulting from production wherein: 1.23×(Al+Mo) %+0.84 (Si+Cr+V) %?0.15×(Co %?15)?2.1, and 14.5×(Al+Cr) %+12×(V+Mo) %+25×Si %?21. The inventive alloy is useful for making electromagnetic actuator mobile cores.

Abstract: The invention concerns a treatment method which consists in coating at least one surface of a brittle thin metal strip (1) with a coating film (3, 3?) comprising at least a polymer material, to obtain on the strip an adhering coat with a thickness ranging between 1 and 100 ?m, modifying the working and breaking properties of the brittle thin strip (1); then carrying out a step wherein the brittle thin metal strip (1) is subjected to stresses, such as a cutting operation, on the brittle thin metal strip (1) coated with the film coating (3, 3?). The method is particularly useful for producing magnetic parts from strips or ribbons with nonocrystalline structure.

Abstract: At least one plane blank (20) is cut out from a sheet of metal material, the blank comprising a main part having the developed shape of the wall of the structural element and at least one additional overlap and fixing tab (26, 27, 28), the cutout blank (20) is folded along a plurality of lines (23) so as to form the wall of the structural element comprising a plurality of annular segments that are not in axial alignment out of folded portions (22, 24, 24?, 25) of the main part of the cutout blank (20), and welding is used to fix at least one additional overlap and fixing tab (26, 27, 28) on at least one of a folded portion (22, 24, 24?, 25) and a second overlap tab.

Abstract: The invention concerns an iron-cobalt alloy, characterised in that it comprises in weight percentages: 10 to 22% of Co; traces to 2.5% of Si; traces to 2% of Al; 0.1 to 1% of Mn; traces to 0.0100% of C; a total of O, N and S content ranging between traces and 0.0070%; a total of Si, Al, Cr, Mo, V, Mn content ranging between 1.1 and 3.5%; a total of Cr, Mo and V content ranging between traces and 3%; a total of Ta and Nb content ranging between traces and 1%; the rest being iron and impurities resulting from production; and in that: 1.23×(Al+Mo)%+0.84 (Si+Cr+V)%?0.15×(Co%?15)?2.1 and in that 14.5×. (Al+Cr)%+12×(V+Mo)%+25×Si%?21. The inventive alloy is useful for making electromagnetic actuator mobile cores.

Abstract: The invention concerns a treatment method which consists in coating at least one surface of a brittle thin metal strip (1) with a coating film (3, 3?) comprising at least a polymer material, to obtain on the strip an adhering coat with a thickness ranging between 1 and 100 ?m, modifying the working and breaking properties of the brittle thin metal strip (1); then carrying out a step wherein the brittle thin metal strip (1) is subjected to stresses, such as a cutting operation, on the brittle thin metal strip (1) coated with the film coating (3, 3?). The method is particularly useful for producing magnetic parts from strips or ribbons with nanocrystalline structure.

Abstract: At least one plane blank (20) is cut out from a sheet of metal material, the blank comprising a main part having the developed shape of the wall of the structural element and at least one additional overlap and fixing tab (26, 27, 28), the cutout blank (20) is folded along a plurality of lines (23) so as to form the wall of the structural element comprising a plurality of annular segments that are not in axial alignment out of folded portions (22, 24, 24′, 25) of the main part of the cutout blank (20), and welding is used to fix at least one additional overlap and fixing tab (26, 27, 28) on at least one of a folded portion (22, 24, 24′, 25) and a second overlap tab.

Abstract: The invention concerns an iron-cobalt alloy, characterised in that it comprises in weight percentages: 10 to 22% of Co; traces to 2.5% of Si; traces to 2% of Al; 0.1 to 1% of Mn; traces to 0.0100% of C; a total of O, N and S content ranging between traces and 0.0070%; a total of Si, Al, Cr, Mo, V, Mn content ranging between 1.1 and 3.5%; a total of Cr, Mo and V content ranging between traces and 3%; a total of Ta and Nb content ranging between traces and 1%; the rest being iron and impurities resulting from production; and in that: 1.23×(Al+Mo) %+0.84 (Si+Cr+V) %−0.15×(Co %−15)≦2.1 and in that 14.5×. (Al+Cr) %+12×(V+Mo) %+25×Si %≧21. The inventive alloy is useful for making electromagnetic actuator mobile cores.

Abstract: Masking device for a flat-screen color-display cathode-ray tube, comprising a support frame for a tensioned shadow mask and a tensioned shadow mask. The support frame is made of a hardened Fe—Ni alloy having a thermal expansion coefficient between 20° C. and 150° C. of less than 5×10−6 K−1 and a yield stress Rp0.2 at 20° C. of greater than 700 MPa; the tensioned shadow mask is made of an Fe—Ni alloy having a thermal expansion coefficient between 20° C. and 150° C. of less than 3×10−6 K−1; the Fe—Ni alloys are chosen so that: below a temperature T1, the mean expansion coefficient &agr;20-T, between 20° C. and T, of the alloy of the support frame is greater than the mean expansion coefficient &agr;20-T of the alloy of the shadow mask, and above T1 the coefficient &agr;20-T of the alloy of the frame is less than the coefficient &agr;20-T of the alloy of the shadow mask, where T1<350° C. and preferably <300° C.

Abstract: A shadow mask support frame for a color cathode ray tube has a rectangular shape overall comprises two end uprights and two lateral uprights. The lateral uprights have a straight main part and two end parts each connected by at least one joining portion to an end upright. The lateral uprights have axes parallel to each other situated in a plane parallel to a reference plane of the frame. Each of the joining portions is in contact through a lateral face with an internal face of a substantially flat wall perpendicular to the reference plane of the frame, so that the end uprights of the frame are in abutment on the joining portions.

Abstract: A method of making a Fe-Ni strip whose chemical composition comprises, by weight: 36% ≦Ni+Co≦43%; 0%≦Co≦3%; 0.05%≦C≦0.4%; 0.2%≦Cr≦1.5%; 0.4%≦Mo≦3%; Cu≦3%; Si≦0.3%, Mn≦0.3%; the rest being iron and impurities, the alloy having an elastic limit Rp0.2 more than 750 Mpa and a distributed elongation Ar more than 5%. The alloy is optionally recast under slag. The strip is obtained by hot-rolling above 950° C., then cold-rolling and carrying out a hardening treatment between 450° C. and 850° C., the hardening heat treatment being preceded by a reduction of at least 40%. The invention is useful for making integrated circuit support grids and electronic gun grids.

Abstract: A maraging steel strip or part and process for manufacture of a strip or of a part cut out of a strip of cold-rolled maraging steel and hardened by a hardening heat treatment. In the process, before the hardening heat treatment is performed, the strip or the part is subjected to cold plastic deformation with a degree of working greater than 30% and the strip or the part is subjected to recrystallization annealing in order to obtain a fine-grained structure with ASTM index higher than 8. The composition by weight of the maraging steel is: 12%≦Ni≦24.5%; 2.5%≦Mo≦12%; 4.17%≦Co≦20%, Al %≦0.15%; Ti≦0.1%; N≦0.003%; Si≦0.1%; Mn≦0.1%; C≦0.005%; S≦0.001%; P≦0.005%; H≦0.0003%; O≦0.001%; iron and impurities resulting from smelting, the chemical composition also satisfying the relationships: 20%≦Ni+Mo≦27%; 50≦Co×Mo≦200; Ti×N≦2×10−4.

Abstract: Process for manufacturing a strip made of an Fe—Ni alloy of the “&ggr;′ and/or &ggr;″ structural hardening” type, the thermal expansion coefficient between 20° C. and 150° C. of which is less than 7×10−6/K, in which a hot strip is manufactured either by hot rolling a semi-finished product or by direct casting of a thin strip which is optionally lightly hot-rolled, and the hot strip is subjected to a softening annealing operation consisting of a soak between 950° C. and 1200° C. followed by rapid cooling and optionally a pickling operation, in order to obtain a softened strip; a cold-worked strip is manufactured by cold rolling the said softened strip, with a reduction ratio of greater than 5%; and the cold-worked strip is subjected to a recrystallization annealing operation in an inert or reducing atmosphere, carried out either on the run with a residence time between 900° C. and 1200° C.

Abstract: A shadow mask support frame for a cathode-ray color display tube of generally rectangular shape in top plan view. The shadow mask support frame includes two end upstands, which are located opposite each other and which are intended to support a shadow mask, and two lateral upstands, which are intended to keep the end upstands apart or separated from each other. The end upstands and the lateral upstands are of generally tubular shape and constitute an almost continuous closed hollow body containing at least one plane closed line located entirely inside the hollow body and passing inside each of the end and lateral upstands. It may be produced by folding a single metal strip or by fitting two drawn shells together.

Abstract: A shadow mask support frame for a colour cathode ray tube has a rectangular shape overall comprises two end uprights and two lateral uprights. The lateral uprights have a straight main part and two end parts each connected by at least one joining portion to an end upright. The lateral uprights have axes parallel to each other situated in a plane parallel to a reference plane of the frame. Each of the joining portions is in contact through a lateral face with an internal face of a substantially flat wall perpendicular to the reference plane of the frame, so that the end uprights of the frame are in abutment on the joining portions.

Abstract: Masking device for a color cathode-ray display tube with a flat scree, of the type comprising a support frame for a tensioned shadowmask and a tensioned shadowmask mounted on the support frame so as to undergo tensioning at room temperature, in which device the support frame is made of a hardened Fe—Ni alloy having a thermal expansion coefficient between 20° and 150° C. of less than 5×1031 6 K−1 and a yield stress Rp0.2 at 20° C. of greater than 700 MPa, and the tensioned shadowmask is made of a hardened FeNi or Fe—Ni alloy having a thermal expansion coefficient between 20° C. and 150° C. of less than 5×10−6 K−1.

Abstract: A maraging steel strip or part and process for manufacture of a strip or of a part cut out of a strip of cold-rolled maraging steel and hardened by a hardening heat treatment. In the process, before the hardening heat treatment is performed, the strip or the part is subjected to cold plastic deformation with a degree of working greater than 30% and the strip or the part is subjected to recrystallization annealing in order to obtain a fine-grained structure with ASTM index higher than 8. The composition by weight of the maraging steel is: 12%≦Ni≦24.5%; 2.5%≦Mo≦12%; 4.17%≦Co≦20%, Al%≦0.15%; Ti≦0.1%; N≦0.003%; Si≦0.1%; Mn≦0.1%; C≦0.005%; S≦0.001%; P≦0.005%; H≦0.0003%; O≦0.001%; iron and impurities resulting from smelting, the chemical composition also satisfying the relationships: 20%≦Ni+Mo≦27%; 50≦Co×Mo≦200; Ti×N≦2×10−4.

Abstract: Soft magnetic alloy of the iron-nickel type, the chemical composition of which comprises, in % by weight: 34%≦Ni≦40%; 7%≦Cr≦10%; 0.5%≦Co≦3%; 0.1%≦Mn≦1%; O≦0.007%; S≦0.002%; N≦0.004%; with N+S+O≦0.01%; iron and impurities 5 resulting from the production process. Use in motors especially suited for use in horology.

Abstract: Cooking vessel intended to be induction heated, comprising a heating part made of a ferromagnetic alloy having a Curie temperature of between 150° C. and 370° C. and a magnetostriction coefficient &lgr;s≦5×10−6 in absolute value. FeNiCuX ferromagnetic alloy for the manufacture of the cooking vessel, the chemical composition of which comprises from 50% to 85% of Ni, less than 50% of Cu, less than 12% of X=Cr+Mo+Mn+Si+Al+W+Nb+V+Ti, the balance being iron and impurities; the composition satisfies the relationships (35/25)×(75-Ni)≦Cu≦(50/35)×(85-Ni) and (7/20)×(Ni-65)≦X≦(12/35)×(Ni-50). Production method and method of use.

Abstract: Cooking vessel intended to be induction heated, comprising a heating part made of a ferromagnetic alloy having a Curie temperature of between 150° C. and 370° C. and a magnetostriction coefficient &lgr;s≦5×10−6 in absolute value. FeNiCuX ferromagnetic alloy for the manufacture of the cooking vessel, the chemical composition of which comprises from 50% to 85% of Ni, less than 50% of Cu, less than 12% of X=Cr+Mo+Mn+Si+Al+W+Nb+V+Ti, the balance being iron and impurities; the composition satisfies the relationships (35/25)×(75−Ni)≦Cu≦(50/35)×(85−Ni) and (7/20)×(Ni−65)≦X≦(12/35)×(Ni−50). Production method and method of use.

Abstract: Soft magnetic alloy of the iron-nickel type, the chemical composition of which comprises, by weight: 40%≦Ni+Co≦65%; 0%≦Co≦7%; 2%≦Cr≦5%; 1%≦Ti≦3%; 0%≦Al≦0.5%; 0%≦Mn+Si≦2%; optionally, up to 3% Mo, 2% W, 2% V, 1.5% Nb, 1% Ta and 3% Cu, the sum of the Cr, Mo, W, V, Nb, Ta and Cu contents being less than 7% and the sum of the Mo, W, V, Nb, Ta and Cu contents being less than 4%; the balance being iron and impurities, such as carbon, sulfur and phosphorus, resulting from the smelting process, the chemical composition furthermore satisfying the relationships: Cr<5−0.015×(Ni+Co−52.5)2, if: Ni+Co≦52.5; Cr<5−0.040×(Ni+Co−52.5)2, if: Ni+Co≧52.5; the alloy having a saturation induction Bs of greater than 0.9 tesla, a coercive field of less than 10 A/m, an electrical resistivity p of greater than 60 &mgr;&OHgr;.cm and a hardness of greater than 200 HV. Process for manufacturing the alloy and uses.